Polymer Engineering Faculty Research

Title

Primary and secondary gas penetration during gas-assisted injection molding. Part I: Formulation and modeling

Document Type

Article

Publication Date

Fall 2004

Abstract

A theoretical study has been carried out on the transient gas-liquid interface development and gas penetration behavior during the cavity filling and gas packing stage in the gas-assisted injection molding (GAIM) of a tube cavity. A mathematical formulation describing the evolution of the gas/melt interface and the distribution of the residual wall thickness of skin melt along with the advancement of gas/melt front is presented. The physical model is put forward on the basis of Hele-Shaw approximation and interface kinematics and dynamics. Numerical simulation is implemented on a fixed mesh covering the entire cavity. The model and simulation can deal with both primary and secondary gas penetrations. The predicted and measuredresults are compared in Part II of this study to validate the theoretical model.

Volume

44

First Page

983

Last Page

991